Machines for and method of making multi-ply bags



J. F. DOYLE l Aug. 20, 1957 MACHINES FOR AND METHOD OF MAKING MULTI-FLY BAGS Filed Aug. 18, 1955 5 Sheets-Sheet l E C l a o R M, V, T V M )n ..N. N F s e m .Y Y B -.o-

nfl e Y F L .--lr f Aug. 20, 1957 J. F. D'oYLE: 2,803,173

MACHINES FOR AND METHOD OF MAKING MULTI-FLY BAGS Filed Aug. 18, 1955 l 5 Sheets-Sheet 2 FIGA Aug. 20, 1957 J. F. DOYLE 2,803,173

MACHINES FOR AND METHOD OF' MAKING MULTI-FLY BAGS Filed Aug. 18, 1955 5 Sheets-Sheet 3 43'/ Tumli Q) u E INVENTOR.

.r James F. Doyle BY ATTORNEYS United States Patent O MACHINES FOR AND` METHOD OF MAKING MULTI-FLY BAGS James F. Doyle, Forest Hills, N. Y., assigner to Arkell Safety Bag Company, New York, N. Y., a corporation of- New York Application August 18, 1955, Serial No. 529,104

11 Claims. (Cl. 93-19) The present invention relates to a machine for and method of making multi-ply bags, and has special reference to the manufacture of such bags made vof crinkled paperhaving the crinkles extending circumferentially of the bag to provide for longitudinal stretchability.

Bags of thistype are frequently used' for chemicals and certain other finely divided material that must be protected from air and moisture, and when thus used are commonly provided with an inner coating or ply of polyethylene or other suitable air and moistureproof material. With such bags, it has been a serious problem to close the bag after filling with a` seam that is of the necessary air and moistureproofness and capable of withstanding the severe strains to which the bag may be subjected during shipment and handling.

One of the objects of the present invention is to provide a machine for and method of making a bag of this character which when filled may be easily and conveniently. closed by a seam which has the desired characteristics as above described.

Other of the objects of the invention are to provide a novel and improved machine for and method of making bags of the character indicated.

The several features of the invention, whereby these and other objects may be attained, will be readily understood from the following description and accompanying drawings, in which:

Figure 1 is a diagrammatical side view of a machine which may be employed in forming my improved bag;

Fig. 2 is a plan view, partly diagrammatical, illustrating the manner in which the plies are folded in forming the bag;

Fig. 3 is a sectional view, on an enlarged scale, taken on the lines 3 3 of Fig. 2;

Fig. 4 is a longitudinal sectional view of the bag;

Fig. 5 is an edge view, partly in section, of the bag when filled but previously to closing;

Fig. 6 is a similar view of the bag when closed;

Fig. 7 is a side view of the bag previously to closing;

Fig. 8 is an end view of the bag;

Fig. 9 is a similar view of the bag when provided with bellows folds; and

Fig. 10 is a diagrammatical side View, corresponding to Fig. 1, of amoditied form of machine.

In forming my improved bag, a web 2 of paper having a coating of polyethylene or other heat-sealable material is folded longitudinally and its longitudinal edges are adhesivelyv secured together to form a attened tube 4 (Fig. 2)'.

This tube may then be fed beneath a guide roll 6 and downwardly between belts or tapes 8 which are driven by rolls 10 over which the tapes pass. From the. tapes 8 the tube passes between belts or tapes 12 which are driven by rolls 14 over which the tapes pass.

The tapes 8 are driven at a greater speed than the tapes 12 so as to form avertical loop 16 in the tube 4 between the two pairs of tapes. At predetermined intervals, a tucking blade 18 engages the tube 4 above the loop and "ice . 2 carries the surplus material provided by the loop between the tapes 12 so asto form folds 19 in the tube that are vspaced apart predetermined distances.

Simultaneously with the feeding of the tube 4, webs 20 and 22, arranged in overlapping relation as shown, are fed longitudinally beneath and at the same surface speed as the pair of tapes 12. The webs 20, 22 pass over a guide roll 24 and beneath folding wheel 26 of the usual bag tube machine. As the webs 20, 22 pass from the guide roller 24 to the wheel 26, the tube 4 with the folds 19 therein pass over said webs 20, 22 and are held thereagainst by a belt or tape 28 which is driven by said folding wheel.

As the tube 4 and the webs 20, 22 pass through the tubing machine, the webs are folded over the tube and the longitudinal edges of each of them are secured together so as to enclose the tube 4.

After passing through the tubing machine, the tube 4 and webs 20, 22 are severed on lines 30 to form the bag lengths, the lines of severance being in proximity to the leading edges of the folds 19. The end of each bag length thus cut off which is remote from the fold 19 may be closed by a suitable seam 32 (Fig. 4).

In using the bag thus formed, the end of the inner tube or ply 4 is pulled out the width of the fold 19. The bag may then be filled through the projecting end ofthe ply 4 as indicated in Fig. 5, and then the end of said ply may be closed by a heat-sealed seam 34. The end of the ply 4 may be rolled or folded on itself and tucked into the bag as shown in Fig. 6. Thereafter the upper ends of the outer plies of the bag may be closed by a sewed or other suitable seam 36. l

It will be apparent that the contents of the bag are effectively protected from air and moisture independently of any leakage occurring through the needle holes or otherwise in the'bag closure seam 36. Also, inasmuch as there is no undue strain placed on the inner tube or ply 4 or in the heat-sealed seam 34 thereof, there is no danger of this seam becoming broken or leaking during handling of the bag inshipment.

Preferably, myimproved bag is of the type of the one described and claimed inthe patent to Greene 2,314,876, dated March 30, 1943. As in the case ofV that bag a plurality ofV outer plies such as 20, 22 are secured together at the crests of the crinkles, and if desired the portion of the inner ply or tube 4 inwardly of the fold 19 may be secured to the adjacent ply at the crests ofthe crinkles so as to cooperate with the outer plies to resist bursting strain, all of the plies being preferably of the same stretchability. While it is preferred that the bag be made of crinkled paper in accordance with said Greene patent, it will be apparent that satisfactory results may be obtained in other types of multi-ply bags such as those made of plain paper, or if desired the inner ply alone may be'made of crinkled paper and the other plies made of plain paper. Also, While it is preferred that the inner ply be coated with a polyethylene or other heat-scalable material this is not necessary in some instances, and in fact the inner ply may be made entirely of polyethylene or other material, preferably moistureproof. The folds 19 in the inner ply may be made so as to enable the ply to be extended any required length to effect the required sealing and tucking or tying in thereof. In the case of a bag: about two feet wide and three and one-half feet long the extension of the length from ten to twelve inches is usually sufficient.

The bag-may be eitherV of the non-gussetted type as shown in Fig. 8, or the gussetted type as shown in Fig. 9. In the case of the gussetted type, the gussets may be made in the tube 4 previously to the tube being enveloped by 4thefouter plies, and upon forming the gussets in the outer pliesand ropeninglup. the bagV and pulling out the fold 19 as described, the gussets in the tube 4 readily adjust themselves to the gussets in the outer plies.

In the machine illustrated in Fig. 10, the tube 4 may be supplied to the machine in a supply roll 38, which is convenient Where the tube is supplied in rolls as in the case of polyethylene tubes, but it will be apparent that the tube may be formed as it is fed to the machine. The tube 4 is drawn from the supply roll 38 or other supply means by horizontal draw rolls 40 between which the tube passes. From these draw rolls, the tube passes between upper and lower draw rolls 42 which may be springpressed.

Also passing between the draw rolls 42, are the web or webs 20, 22 which are guided thereto by means of guide rolls 44. Thus the tube 4 and the webs 20, 22 are fed together by the draw rolls 42.

After leaving the draw rolls, the tube 4 and Webs 20, 22 pass to the usual tubing devices 43 which fold the webs about the tube and secures their longitudinal edges together, and the thus formed tubing is severed into bag lengths as above described by means of cutting otf knives 45, that are operated in time relation to the feeding of the tube and web and the tube folding device hereinafter described.

The draw rolls 40 are fed at a predetermined greater speed than the draw rolls 42 so as to form the vertical loop 16 in the tube 4.

At predetermined interval a tucking blade 46 mounted to swing about a pivot 48, engages the tube 4 above the loop, and forces the tube into the bite of the draw rolls 42 so as to form the double transverse folds 19 in the tube as the rolls feed the tube and web.

lt was found that with this mechanism the bags may be uniformly formed at relatively high speed, and it is especially efficient when the inner tube 4 is of polyethylene or other plastic tubing that is supplied to the bag manufacturer in rolls.

As will be evident to those skilled in the art, my invention permits various modifications without departing from the spirit thereof or the scope of the appended claims.

The present application is a continuation in part of my pending application Serial No. 249,319, filed October 2, 1951, which has matured into Patent No. 2,73 7,339, dated March 6, 1956.

What I claim is:

1. The method of forming a bag of the class described which comprises feeding a web longitudinally and folding it to form a flattened tube with the longitudinal edges of the tube secured together, folding the tube transversely upon itself at predetermined intervals, folding a` plurality of webs longitudinally about said tube with the longitudinal edges of the webs secured together, and cutting off bag lengths from the composite web on lines adjacent corresponding sides of said folds.

2. The method of forming a bag of the class described which comprises feeding a web longitudinally and folding it to form a attened tube with the longitudinal edges of the tube secured together, folding the tube transversely upon itself at predetermined intervals, feeding'a plurality of webs longitudinally and securing them together at the crests of their crinkles and foldingl them about the tube thus formed with the longitudinal edges of the web secured together, and cutting off bag lengths from the composite web on lines adjacent the corresponding sides of the folds, and closing the end of each bag length remote from the fold in its inner ply.

3. The method of forming a bag of the class described which comprises feeding a web longitudinally, feeding a flattened tube longitudinally adjacent one side of the web, double folding the tube transversely upon itself at predetermined intervals as it is being fed, folding the web longitudinally about said tube and securing the longitudinal edges of the web together, and cutting oi bag lengths 3, from the multi-ply tubing thus formed on lines adjacent the corresponding sides of said transverse double folds.

4. The method of forming a bag of the class described which comprises feeding a web longitudinally and folding it to form a flattened tube with the longitudinal edges of the tube secured together, double folding the tube transversely upon itself at predetermined intervals, folding a web longitudinally about said tube with the longitudinal edges of the web secured together, and cutting oi bag lengths from the multi-ply tubing thus formed on lines adjacent corresponding sides of said transverse folds.

5. The method of forming a bag of the class described which comprises feeding a tube longitudinally, double folding the tube transversely upon itself at predetermined intervals, folding a web longitudinally about said tube and securing the longitudinal edges-thereof together and cutting olf bag lengths from the multi-ply tubing thus formed on lines adjacent the corresponding sides of said transverse folds.

6. The method of forming a bag of the class described which comprises forming transverse double folds in a tube at spaced intervals, folding a web about the tube and securing its longitudinal edges together, and severing the thus formed composite tubing on a line positioned between adjacent double folds of the tube.

7. A machine for forming bags of the class described 'comprising a pair of travelling belts having runs thereof parallel and in close proximity, means for guiding a web in the form of a tube between said runs of the belts whereby the tube is fed longitudinally by the belts, a second pair of travelling belts having runs thereof parallel in close proximity for receiving said tube after it leaves the first-mentioned pair of belts and for feeding the tube 1ongitudinally, said first-mentioned pair of belts being driven at a greater speed than the other pair so as to cause slack to occur in the tube between the two pairs of belts, a reciprocating blade acting at predetermined intervals to tuck in the slack in the tube between the second-mentioned pair of belts so as to cause folds to be formed in said tube,l the folds being spacedl predetermined distances apart, means for feeding a plurality of webs longitudinally in contact with one side of the tube as the tube leaves said second-mentioned pair of belts, and means for thereafter folding said webs about the tube.

S. In a machine for forming bags of the class described, means for feeding a tube and a web longitudinally in superposed relation, means for forming transverse double folds in the tube at spaced intervals asit is being fed, means for folding the web longitudinally about the tube and securing its longitudinal edges together, and means for severing the thus formed composite tubing on aline positioned between adjacent double folds of the tube.

9. In a machine for forming bags of the classjdescribed, means comprising draw rolls for feeding a tube and-,a web longitudinally in superposed relation, means for forming a loop in the tube at spaced points in proximity to the front sides of the rolls, means for tucking the tube adjacent each loop into the bite of said rolls to form double folds in the tube spaced apart predetermined distances as the tube and web are fed, and means for folding the web longitudinally about the tube and securingits longitudinal edges together.

10. ln a machine for forming bags of the class described, a pair of rolls for feeding a tube longitudinally in a downward direction, a second pair of rolls for feeding the tube and a web longitudinally in a transverse direction, the tube and web passing between the secondmentioned pair of rolls with the tube extending over the web, the surface speed of the first-mentioned pair of rolls being greater than that of the second-mentioned pairof draw rolls so as to cause a loop of predetermined length to be formed in the tube adjacent the front sides of the latter rolls, means for tucking the tube adjacent each loop into the bite of the second-mentioned rolls so as to form a double fold in the tube as the tube is fed between the 5 6 latter rolls, and means for folding the web longitudinally References Cited in the file of this patent about the tube and severing its longitudinal edges together. UNITED STATES PATENTS 11. A structure according to claim 10 1n which the means for tucking the tube into the bite of the second- 205,133 Porter June 18' 1878 mentioned pair of rolls comprises a reciprocating blade. 5 1746'623 Tooker et al Feb- 11 1930 2,206,965 Lakso July 9, 1940 

